The Sliding Filament Theory in my own terms...

[brebandi5]

So there's this guy. His name is acetylcholine but we'll call him ACh for short

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[huy_sauce]

rotator cuff... teres minor, infraspinatus... hahah, acitn, myosin, cross bridges??? i hate all that muscle shit. don't get me started with the muscles of the leg, this flexes that, extension, rotation...medially, internally??? ok, i'm done. good luck. we should meet in casa grande to study.